Persistence filters allow unquoted units (#4681)

* allow filters without quotes around units

Signed-off-by: Mark Herwege <mark.herwege@telenet.be>

bundles/org.openhab.core.model.persistence/src/org/openhab/core/model/persistence/Persistence.xtext

@@ -32,7 +32,7 @@ FilterDetails:
 ;
 
 ThresholdFilter:
-	'>' (relative?='%')? value=DECIMAL unit=STRING?
+	'>' (relative?='%')? value=DECIMAL unit=(UNIT|STRING)?
 ;
 
 TimeFilter:
@@ -48,11 +48,11 @@ NotEqualsFilter:
 ;
 
 IncludeFilter:
-  '[]' lower=DECIMAL upper=DECIMAL unit=STRING?
+	'[]' lower=DECIMAL upper=DECIMAL unit=(UNIT|STRING)?
 ;
 
 NotIncludeFilter:
-  '][' lower=DECIMAL upper=DECIMAL unit=STRING?
+	'][' lower=DECIMAL upper=DECIMAL unit=(UNIT|STRING)?
 ;
 
 
@@ -92,3 +92,7 @@ AliasConfiguration:
 DECIMAL returns ecore::EBigDecimal :
 	'-'? INT ('.' INT)?
 ;
+
+UNIT:
+	(('^' INT)|'²'|'³'|'/'|'*'|'·'|'°'|'µ'|'%'|'‰'|'Ω'|'Å'|'('|')'|ID)+
+;